Planned Update (very soon): gameplay trait versions of these traits to allow for more trait space; however, I also very much recommend More CAS Traits For Sims to use with these traits.

This mod used to live on my tumblr (here ) but now MTS will be considered its home.

All traits are in separate packages within one zip, so if there is a trait you don't want, you can delete its package.

Here's what each trait does:

Alien Hater: “Alien Haters despise aliens and are disgusted by their very existence”
Type: Personality, Social
Features: Angry proximity buffs from both aliens (+2) and sims involved in alien pregnancy (+4)! Alien Haters can also complain about aliens, making non alien hating sims Embarrassed (+3) and fellow alien hating sims Happy (+5, because it's hard to find someone else sharing the haterade :p), each for 4 hours. Alien Haters can also hurl Anti Alien Insults and make Aliens tense (+5) from their hateful words. They can also insult alien genes when they feel angry about a nearby alien pregnancy. Alien Haters now give a +4 tense buff to nearby aliens.
Requirements: Get To Work (because aliens), the icon comes from Outdoor Retreat so let me know if that causes an issue!

Seasonal Affective Disorder (SAD): “Sims with SAD become depressed during the Fall and Winter months”
Type: Personality, Emotional
Features: Sad (+4) buff from the Fall & Winter seasons, provided it’s not terribly hot outside. Probably most useful anywhere but Oasis Springs.
Known Issues: Buffs/Loot acquired from Season and Temperature proximity take some time to show up when you first load up (all later loads will not have this problem), most of the time (sometimes it is fast), but it will appear within a few sim hours.
Requirements: Seasons

Hay Fever: “Sims with hay fever suffer throughout the Spring months”
Type: Personality, Lifestyle
Features: Uncomfortable (+3) buff during Spring, causes coughing and sneezing. Flower Arranging Skill gain is decreased (hard to learn when you’re sneezing all the time!). Buff now comes with overlay support.
Known Issue: See SAD Trait
Requirements: Seasons, Get To Work for the idle animations

Allergic to Cats/Allergic to Dogs: “Sims allergic to [cats/dogs] have a hard time being near [cats/dogs] without sneezing!”
Type: Personality, Lifestyle
Features: Uncomfortable (+3) buff around [cats/dogs], causes coughing and sneezing. Uncomfortable (+2) buff on vet and [cat/dog] friendly lots. Buffs now come with overlay support.
Requirements: Cats & Dogs, Get To Work for the idle animations

Hates Heat: “Sims who hate heat do not enjoy warm weather! Air Conditioning only lasts so long, these sims just really hate the heat!”
Type: Personality, Lifestyle
Features: Uncomfortable (+4) buff when it is hot; it goes away as long as they have the “refreshing air conditioning buff” but as soon as that wears off, there’s no fooling them: these sims know when it’s just too hot! When this buff is active, they will play “melting” animations. Sims are drama queens!
Requirements: Seasons

Can’t Stand Cold: “Sims who can’t stand cold dislike cold weather. Heating only lasts so long, they just really can’t stand the cold!”
Type: Personality, Lifestyle
Features: Uncomfortable (+4) buff when it is cold; it goes away as long as they have the “central heating” buff but as soon as that wears off, there’s no fooling them: these sims know when it’s just too cold! When this buff is active, they will play “freezing” animations. Sims are drama queens!
Requirements: Seasons

Fame Jealous: “Sims who are fame jealous feel negatively towards celebrities.“
Type: Personality, Social
Features: Sad Buff (+3) when near celebrity sims, Angry Buff (+3) as well when those sims happen to have a less than good reputation.
Requirements: Get Famous, Icon comes from Parenthood. Will update when Get Famous icons can be used in Constructor.

Chronic Headaches: "Sims with chronic headaches go through life often with a pain in the head."
Type: Personality, Lifestyle
Features: Uncomfortable (+4) occasional buff with headache idles.
Requirements: Get to Work for idle animations.

**NEW**Allergic To Magic: "Sims who are allergic to magic sneeze whenever their immune systems sense magical presence."
Type: Personality, Lifestyle
Features: Uncomfortable (+2 to +4) buffs when in the presence of spellcasters, familiars, and Magic HQ. They also will not be pleased should you ever make them a spellcaster. (To be honest I don't know why I made this trait, but have fun) Buffs come with overlay support.
Requirements: Realm of Magic, Get to Work for idle animations, patience with the goofiness of this trait.

~~Compatibility
This mod does not alter any in-game resources so there is no worry about conflicts.

Notes
I heard loud and clear about moodlet balancing from the Chat Pack responses. Unfortunately, the nature of these current traits I don't feel like they call for smaller moodlets (since they're meant to add some misery for your sims), but for future traits I would love to consider some traits that would go well with moodlets that have less weight.